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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of comprehensive income [abstract] |  |  |
Net actuarial gains (losses) | $ (3) | $ (7) | $ 5
Gain (losses) on derivatives designated as cash flow hedges, income tax expense (recovery) | 8 | 16 | (1)
Reclassification of gains on derivatives designated as cash flow hedges to net earnings, income tax expense | $ 31 | $ 10 | $ 11

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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_90&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Income Tax Expense (Recovery) Relating To Gains On Derivatives Designated As Cash Flow Hedges Of Other Comprehensive Income + References No definition available. + Details
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